If I have a GeoJSON file of a certain city's wards, how would I figure out which ward I'm in based on my lat/long coordinates?

This page summarizes the projects mentioned and recommended in the original post on /r/gis
spatialite gdal Sqlite geos Emscripten

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  • spl.js

    SpatiaLite for browser & node

    • We've recently been using more client-side (browser based approaches for this type of work) that have more horsepower and functionality than TurfJS) we've successfully used both https://github.com/jvail/spl.js Web Assembly Version

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    Convert raster and vector geospatial data to various formats and coordinate systems entirely in the browser.

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